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JavaScript FizzBuzz

Published: Jul 4, 2018

Last updated: Jul 4, 2018

    This blog assumes a global install of mocha, although that can also be installed locally. chai is also required as the assertion library - install as a dev dependency.

    Writing tests

    Create fizzbuzz.mocha.js.

    const lib = require("./index"); const chai = require("chai"); const { expect } = chai; describe("check basic function", function () { it("should return when not part of fizz buzz", function () { const res = lib.run(2); expect(res).to.equal(2); }); it("should return fizz", function () { const res = lib.run(3); expect(res).to.equal("Fizz"); }); it("should return buzz", function () { const res = lib.run(5); expect(res).to.equal("Buzz"); }); it("should return fizzbuzz", function () { const res = lib.run(15); expect(res).to.equal("FizzBuzz"); }); });

    Main js file

    Create index.js:

    const run = (arg) => { switch (true) { case arg % 15 === 0: return "FizzBuzz"; case arg % 3 === 0: return "Fizz"; case arg % 5 === 0: return "Buzz"; default: return arg; } }; module.exports = { run, };

    Testing

    Change into directory and run mocha fizzbuzz.mocha.js.

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    Dennis O'Keeffe

    @dennisokeeffe92
    • Melbourne, Australia

    Hi, I am a professional Software Engineer. Formerly of Culture Amp, UsabilityHub, Present Company and NightGuru.
    I am currently working on Visibuild.

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    JavaScript FizzBuzz

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